Crassulacean Acid Metabolism in Three Species of the C4 Genus Portulaca

@article{Kraybill1996CrassulaceanAM,
  title={Crassulacean Acid Metabolism in Three Species of the C4 Genus Portulaca},
  author={Anthony A. Kraybill and Craig Edwin Martin},
  journal={International Journal of Plant Sciences},
  year={1996},
  volume={157},
  pages={103 - 109}
}
The putative existence of Crassulacean acid metabolism was investigated in three succulent species of the C4 genus Portulaca: P. grandiflora (a widely cultivated species), P. oleracea (a cosmopolitan weed), and P. mundula (found on rock outcrops throughout the southwestern United States). Patterns of diurnal conductance and CO2 exchange, as well as diurnal tissue malic acid fluctuations, were measured in plants under well-watered and drought-stressed conditions. Net CO2 uptake in both… 
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Low levels of crassulacean acid metabolism (CAM) are demonstrated in two species with C4 photosynthesis, Portulaca cyclophylla and P. digyna. The expression of CAM in P. cyclophylla and P. digyna is
Photosynthetic Pathway Variation in Leafy Members of Two Subfamilies of the Cactaceae
TLDR
The results of this study indicate that members of the Pereskioideae should be restricted to moister habitats or must restrict the timing of growth to wet seasons, whereas the observed combinations of the C3 and CAM pathways in the opuntioid taxa should prove beneficial in conserving water in the sporadically arid tropical and subtropical habitats of these plants.
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TLDR
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Two case studies are presented illustrating how the behaviour of plants using crassulacean acid metabolism (CAM) provides adaptation to salinity. Perennial cacti having constitutive CAM show
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